drivers/oprofile/cpu_buffer.h

   1 /**
   2  * @file cpu_buffer.h
   3  *
   4  * @remark Copyright 2002-2009 OProfile authors
   5  * @remark Read the file COPYING
   6  *
   7  * @author John Levon <levon@movementarian.org>
   8  * @author Robert Richter <robert.richter@amd.com>
   9  */
  10
  11 #ifndef OPROFILE_CPU_BUFFER_H
  12 #define OPROFILE_CPU_BUFFER_H
  13
  14 #include <linux/types.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/workqueue.h>
  17 #include <linux/cache.h>
  18 #include <linux/sched.h>
  19 #include <linux/ring_buffer.h>
  20
  21 struct task_struct;
  22
  23 int alloc_cpu_buffers(void);
  24 void free_cpu_buffers(void);
  25
  26 void start_cpu_work(void);
  27 void end_cpu_work(void);
  28
  29 /* CPU buffer is composed of such entries (which are
  30  * also used for context switch notes)
  31  */
  32 struct op_sample {
  33         unsigned long eip;
  34         unsigned long event;
  35         unsigned long data[0];
  36 };
  37
  38 struct op_entry {
  39         struct ring_buffer_event *event;
  40         struct op_sample *sample;
  41         unsigned long irq_flags;
  42         unsigned long size;
  43         unsigned long *data;
  44 };
  45
  46 struct oprofile_cpu_buffer {
  47         unsigned long buffer_size;
  48         struct task_struct *last_task;
  49         int last_is_kernel;
  50         int tracing;
  51         unsigned long sample_received;
  52         unsigned long sample_lost_overflow;
  53         unsigned long backtrace_aborted;
  54         unsigned long sample_invalid_eip;
  55         int cpu;
  56         struct delayed_work work;
  57 };
  58
  59 DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
  60
  61 /*
  62  * Resets the cpu buffer to a sane state.
  63  *
  64  * reset these to invalid values; the next sample collected will
  65  * populate the buffer with proper values to initialize the buffer
  66  */
  67 static inline void op_cpu_buffer_reset(int cpu)
  68 {
  69         struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
  70
  71         cpu_buf->last_is_kernel = -1;
  72         cpu_buf->last_task = NULL;
  73 }
  74
  75 struct op_sample
  76 *op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);
  77 int op_cpu_buffer_write_commit(struct op_entry *entry);
  78 struct op_sample *op_cpu_buffer_read_entry(int cpu);
  79 unsigned long op_cpu_buffer_entries(int cpu);
  80
  81 /* transient events for the CPU buffer -> event buffer */
  82 #define CPU_IS_KERNEL 1
  83 #define CPU_TRACE_BEGIN 2
  84 #define IBS_FETCH_BEGIN 3
  85 #define IBS_OP_BEGIN    4
  86
  87 #endif /* OPROFILE_CPU_BUFFER_H */